Bombus lucorum – White-tailed Bumblebee
The jury is out on whether the Buff-tailed and White-tailed Bumblebees are separate species. Often it is hard to separate them by eye anyway. This individual (2014) shows no hint of a buff fringe so I believe it to be a White-tailed Bumblebee (Bombus lucorum).
They show a fair amount of colour variation… as do most other species… but I think these (2017) are the same species.